These Muck Muckster Pet Lover's shoes feature breathable Airmesh lining. Stretch-fit topline binding snugs ankles to keep diret, leaves, grit and pebbles out. Flex- foam bootie with four-way stretch nylon, 100% waterproof, lightweight, flexible and buoyant. Diamond tread, self- cleaning outsole. Full-perimeter wrapped outsole provides maximum protection to the toe, arch and heel area.